sapphire 7870 xt vs club3d 7950 royalking

I'm looking for a new card to upgrade my sapphire 4890. I have a core i7 920 @3.8 ghz. I'm gaming at 1920*1080. The sapphire is about 50 euro's cheaper than the club3d card, but the club3d comes with a gamesbundle (far cry 3, sleeping dogs en some other titles). Is there a lot of difference in performance between these cards? The club3d will perform better when overclocked I guess.
When I sell the games I can probably bring down the price to the level of the sapphire card.